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Per the WebXR spec, the viewer pose should have emulatedPosition = true
when the headset only has 3DoF tracking - either by its default
capabilities or due to temporary tracking loss. Fortunately, the GVR
API exposes a "has 6DoF tracking" property that we can check.

Bug: 1011105
Change-Id: I2a80322c76c708d686b1fa89a57bb7374bed0999
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845992
Commit-Queue: Jacob DeWitt <jacde@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703851}